forked from sin365/AxibugEmuOnline
549 lines
20 KiB
C#
549 lines
20 KiB
C#
using System;
|
|
|
|
namespace VirtualNes.Core
|
|
{
|
|
public class APU_FDS : APU_INTERFACE
|
|
{
|
|
FDSSOUND fds = new FDSSOUND();
|
|
FDSSOUND fds_sync = new FDSSOUND();
|
|
int[] output_buf = new int[8];
|
|
int sampling_rate;
|
|
|
|
public APU_FDS()
|
|
{
|
|
fds.ZeroMemory();
|
|
fds_sync.ZeroMemory();
|
|
|
|
Array.Clear(output_buf, 0, output_buf.Length);
|
|
|
|
sampling_rate = 22050;
|
|
}
|
|
|
|
public override void Reset(float fClock, int nRate)
|
|
{
|
|
fds.ZeroMemory();
|
|
fds_sync.ZeroMemory();
|
|
|
|
sampling_rate = 22050;
|
|
}
|
|
|
|
public override void Setup(float fClock, int nRate)
|
|
{
|
|
sampling_rate = nRate;
|
|
}
|
|
|
|
int[] tbl_writesub = { 30, 20, 15, 12 };
|
|
|
|
private void WriteSub(ushort addr, byte data, FDSSOUND ch, double rate)
|
|
{
|
|
if (addr < 0x4040 || addr > 0x40BF)
|
|
return;
|
|
|
|
ch.reg[addr - 0x4040] = data;
|
|
if (addr >= 0x4040 && addr <= 0x407F)
|
|
{
|
|
if (ch.wave_setup != 0)
|
|
{
|
|
ch.main_wavetable[addr - 0x4040] = 0x20 - (data & 0x3F);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
switch (addr)
|
|
{
|
|
case 0x4080: // Volume Envelope
|
|
ch.volenv_mode = (byte)(data >> 6);
|
|
if ((data & 0x80) != 0)
|
|
{
|
|
ch.volenv_gain = (byte)(data & 0x3F);
|
|
|
|
// 即時反映
|
|
if (ch.main_addr == 0)
|
|
{
|
|
ch.now_volume = (ch.volenv_gain < 0x21) ? ch.volenv_gain : 0x20;
|
|
}
|
|
}
|
|
// エンベロープ1段階の演算
|
|
ch.volenv_decay = (byte)(data & 0x3F);
|
|
ch.volenv_phaseacc = (double)ch.envelope_speed * (double)(ch.volenv_decay + 1) * rate / (232.0 * 960.0);
|
|
break;
|
|
|
|
case 0x4082: // Main Frequency(Low)
|
|
ch.main_frequency = (ch.main_frequency & ~0x00FF) | data;
|
|
break;
|
|
case 0x4083: // Main Frequency(High)
|
|
ch.main_enable = (byte)((~data) & (1 << 7));
|
|
ch.envelope_enable = (byte)((~data) & (1 << 6));
|
|
if (ch.main_enable == 0)
|
|
{
|
|
ch.main_addr = 0;
|
|
ch.now_volume = (ch.volenv_gain < 0x21) ? ch.volenv_gain : 0x20;
|
|
}
|
|
// ch.main_frequency = (ch.main_frequency&0x00FF)|(((INT)data&0x3F)<<8);
|
|
ch.main_frequency = (ch.main_frequency & 0x00FF) | ((data & 0x0F) << 8);
|
|
break;
|
|
|
|
case 0x4084: // Sweep Envelope
|
|
ch.swpenv_mode = (byte)(data >> 6);
|
|
if ((data & 0x80) != 0)
|
|
{
|
|
ch.swpenv_gain = (byte)(data & 0x3F);
|
|
}
|
|
// エンベロープ1段階の演算
|
|
ch.swpenv_decay = (byte)(data & 0x3F);
|
|
ch.swpenv_phaseacc = (double)ch.envelope_speed * (double)(ch.swpenv_decay + 1) * rate / (232.0 * 960.0);
|
|
break;
|
|
|
|
case 0x4085: // Sweep Bias
|
|
if ((data & 0x40) != 0) ch.sweep_bias = (data & 0x3f) - 0x40;
|
|
else ch.sweep_bias = data & 0x3f;
|
|
ch.lfo_addr = 0;
|
|
break;
|
|
|
|
case 0x4086: // Effector(LFO) Frequency(Low)
|
|
ch.lfo_frequency = (ch.lfo_frequency & (~0x00FF)) | data;
|
|
break;
|
|
case 0x4087: // Effector(LFO) Frequency(High)
|
|
ch.lfo_enable = (byte)((~data & 0x80));
|
|
ch.lfo_frequency = (ch.lfo_frequency & 0x00FF) | ((data & 0x0F) << 8);
|
|
break;
|
|
|
|
case 0x4088: // Effector(LFO) wavetable
|
|
if (ch.lfo_enable == 0)
|
|
{
|
|
// FIFO?
|
|
for (byte i = 0; i < 31; i++)
|
|
{
|
|
ch.lfo_wavetable[i * 2 + 0] = ch.lfo_wavetable[(i + 1) * 2 + 0];
|
|
ch.lfo_wavetable[i * 2 + 1] = ch.lfo_wavetable[(i + 1) * 2 + 1];
|
|
}
|
|
ch.lfo_wavetable[31 * 2 + 0] = (byte)(data & 0x07);
|
|
ch.lfo_wavetable[31 * 2 + 1] = (byte)(data & 0x07);
|
|
}
|
|
break;
|
|
|
|
case 0x4089: // Sound control
|
|
{
|
|
ch.master_volume = tbl_writesub[data & 3];
|
|
ch.wave_setup = (byte)(data & 0x80);
|
|
}
|
|
break;
|
|
|
|
case 0x408A: // Sound control 2
|
|
ch.envelope_speed = data;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
public override void Write(ushort addr, byte data)
|
|
{
|
|
WriteSub(addr, data, fds, sampling_rate);
|
|
}
|
|
|
|
public override byte Read(ushort addr)
|
|
{
|
|
byte data = (byte)(addr >> 8);
|
|
|
|
if (addr >= 0x4040 && addr <= 0x407F)
|
|
{
|
|
data = (byte)(fds.main_wavetable[addr & 0x3F] | 0x40);
|
|
}
|
|
else
|
|
if (addr == 0x4090)
|
|
{
|
|
data = (byte)((fds.volenv_gain & 0x3F) | 0x40);
|
|
}
|
|
else
|
|
if (addr == 0x4092)
|
|
{
|
|
data = (byte)((fds.swpenv_gain & 0x3F) | 0x40);
|
|
}
|
|
|
|
return data;
|
|
}
|
|
|
|
int[] tbl_process = { 0, 1, 2, 4, 0, -4, -2, -1 };
|
|
public override int Process(int channel)
|
|
{
|
|
// Envelope unit
|
|
if (fds.envelope_enable != 0 && fds.envelope_speed != 0)
|
|
{
|
|
// Volume envelope
|
|
if (fds.volenv_mode < 2)
|
|
{
|
|
double decay = ((double)fds.envelope_speed * (double)(fds.volenv_decay + 1) * (double)sampling_rate) / (232.0 * 960.0);
|
|
fds.volenv_phaseacc -= 1.0;
|
|
while (fds.volenv_phaseacc < 0.0)
|
|
{
|
|
fds.volenv_phaseacc += decay;
|
|
|
|
if (fds.volenv_mode == 0)
|
|
{
|
|
// 減少モード
|
|
if (fds.volenv_gain != 0)
|
|
fds.volenv_gain--;
|
|
}
|
|
else
|
|
if (fds.volenv_mode == 1)
|
|
{
|
|
if (fds.volenv_gain < 0x20)
|
|
fds.volenv_gain++;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Sweep envelope
|
|
if (fds.swpenv_mode < 2)
|
|
{
|
|
double decay = ((double)fds.envelope_speed * (double)(fds.swpenv_decay + 1) * (double)sampling_rate) / (232.0 * 960.0);
|
|
fds.swpenv_phaseacc -= 1.0;
|
|
while (fds.swpenv_phaseacc < 0.0)
|
|
{
|
|
fds.swpenv_phaseacc += decay;
|
|
|
|
if (fds.swpenv_mode == 0)
|
|
{
|
|
// 減少モード
|
|
if (fds.swpenv_gain != 0)
|
|
fds.swpenv_gain--;
|
|
}
|
|
else
|
|
if (fds.swpenv_mode == 1)
|
|
{
|
|
if (fds.swpenv_gain < 0x20)
|
|
fds.swpenv_gain++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Effector(LFO) unit
|
|
int sub_freq = 0;
|
|
// if( fds.lfo_enable && fds.envelope_speed && fds.lfo_frequency ) {
|
|
if (fds.lfo_enable != 0)
|
|
{
|
|
if (fds.lfo_frequency != 0)
|
|
{
|
|
fds.lfo_phaseacc -= (1789772.5 * (double)fds.lfo_frequency) / 65536.0;
|
|
while (fds.lfo_phaseacc < 0.0)
|
|
{
|
|
fds.lfo_phaseacc += (double)sampling_rate;
|
|
|
|
if (fds.lfo_wavetable[fds.lfo_addr] == 4)
|
|
fds.sweep_bias = 0;
|
|
else
|
|
fds.sweep_bias += tbl_process[fds.lfo_wavetable[fds.lfo_addr]];
|
|
|
|
fds.lfo_addr = (fds.lfo_addr + 1) & 63;
|
|
}
|
|
}
|
|
|
|
if (fds.sweep_bias > 63)
|
|
fds.sweep_bias -= 128;
|
|
else if (fds.sweep_bias < -64)
|
|
fds.sweep_bias += 128;
|
|
|
|
int sub_multi = fds.sweep_bias * fds.swpenv_gain;
|
|
|
|
if ((sub_multi & 0x0F) != 0)
|
|
{
|
|
// 16で割り切れない場合
|
|
sub_multi = (sub_multi / 16);
|
|
if (fds.sweep_bias >= 0)
|
|
sub_multi += 2; // 正の場合
|
|
else
|
|
sub_multi -= 1; // 負の場合
|
|
}
|
|
else
|
|
{
|
|
// 16で割り切れる場合
|
|
sub_multi = (sub_multi / 16);
|
|
}
|
|
// 193を超えると-258する(-64へラップ)
|
|
if (sub_multi > 193)
|
|
sub_multi -= 258;
|
|
// -64を下回ると+256する(192へラップ)
|
|
if (sub_multi < -64)
|
|
sub_multi += 256;
|
|
|
|
sub_freq = (fds.main_frequency) * sub_multi / 64;
|
|
}
|
|
|
|
// Main unit
|
|
int output = 0;
|
|
if (fds.main_enable != 0 && fds.main_frequency != 0 && fds.wave_setup == 0)
|
|
{
|
|
int freq;
|
|
int main_addr_old = fds.main_addr;
|
|
|
|
freq = (int)((fds.main_frequency + sub_freq) * 1789772.5 / 65536.0);
|
|
|
|
fds.main_addr = (fds.main_addr + freq + 64 * sampling_rate) % (64 * sampling_rate);
|
|
|
|
// 1周期を超えたらボリューム更新
|
|
if (main_addr_old > fds.main_addr)
|
|
fds.now_volume = (fds.volenv_gain < 0x21) ? fds.volenv_gain : 0x20;
|
|
|
|
output = fds.main_wavetable[(fds.main_addr / sampling_rate) & 0x3f] * 8 * fds.now_volume * fds.master_volume / 30;
|
|
|
|
if (fds.now_volume != 0)
|
|
fds.now_freq = freq * 4;
|
|
else
|
|
fds.now_freq = 0;
|
|
}
|
|
else
|
|
{
|
|
fds.now_freq = 0;
|
|
output = 0;
|
|
}
|
|
|
|
// LPF
|
|
output = (output_buf[0] * 2 + output) / 3;
|
|
output_buf[0] = output;
|
|
|
|
fds.output = output;
|
|
return fds.output;
|
|
}
|
|
|
|
internal void SyncWrite(ushort addr, byte data)
|
|
{
|
|
WriteSub(addr, data, fds_sync, 1789772.5d);
|
|
}
|
|
|
|
|
|
|
|
internal byte SyncRead(ushort addr)
|
|
{
|
|
byte data = (byte)(addr >> 8);
|
|
|
|
if (addr >= 0x4040 && addr <= 0x407F)
|
|
{
|
|
data = (byte)(fds_sync.main_wavetable[addr & 0x3F] | 0x40);
|
|
}
|
|
else
|
|
if (addr == 0x4090)
|
|
{
|
|
data = (byte)((fds_sync.volenv_gain & 0x3F) | 0x40);
|
|
}
|
|
else
|
|
if (addr == 0x4092)
|
|
{
|
|
data = (byte)((fds_sync.swpenv_gain & 0x3F) | 0x40);
|
|
}
|
|
|
|
return data;
|
|
}
|
|
|
|
public override bool Sync(int cycles)
|
|
{
|
|
// Envelope unit
|
|
if (fds_sync.envelope_enable != 0 && fds_sync.envelope_speed != 0)
|
|
{
|
|
// Volume envelope
|
|
double decay;
|
|
if (fds_sync.volenv_mode < 2)
|
|
{
|
|
decay = ((double)fds_sync.envelope_speed * (double)(fds_sync.volenv_decay + 1) * 1789772.5) / (232.0 * 960.0);
|
|
fds_sync.volenv_phaseacc -= (double)cycles;
|
|
while (fds_sync.volenv_phaseacc < 0.0)
|
|
{
|
|
fds_sync.volenv_phaseacc += decay;
|
|
|
|
if (fds_sync.volenv_mode == 0)
|
|
{
|
|
// 減少モード
|
|
if (fds_sync.volenv_gain != 0)
|
|
fds_sync.volenv_gain--;
|
|
}
|
|
else
|
|
if (fds_sync.volenv_mode == 1)
|
|
{
|
|
// 増加モード
|
|
if (fds_sync.volenv_gain < 0x20)
|
|
fds_sync.volenv_gain++;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Sweep envelope
|
|
if (fds_sync.swpenv_mode < 2)
|
|
{
|
|
decay = ((double)fds_sync.envelope_speed * (double)(fds_sync.swpenv_decay + 1) * 1789772.5) / (232.0 * 960.0);
|
|
fds_sync.swpenv_phaseacc -= (double)cycles;
|
|
while (fds_sync.swpenv_phaseacc < 0.0)
|
|
{
|
|
fds_sync.swpenv_phaseacc += decay;
|
|
|
|
if (fds_sync.swpenv_mode == 0)
|
|
{
|
|
// 減少モード
|
|
if (fds_sync.swpenv_gain != 0)
|
|
fds_sync.swpenv_gain--;
|
|
}
|
|
else
|
|
if (fds_sync.swpenv_mode == 1)
|
|
{
|
|
// 増加モード
|
|
if (fds_sync.swpenv_gain < 0x20)
|
|
fds_sync.swpenv_gain++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
public override int GetFreq(int channel)
|
|
{
|
|
return fds.now_freq;
|
|
}
|
|
|
|
public override uint GetSize()
|
|
{
|
|
return fds.GetSize() + fds_sync.GetSize();
|
|
}
|
|
|
|
public override void SaveState(StateBuffer buffer)
|
|
{
|
|
fds.SaveState(buffer);
|
|
fds_sync.SaveState(buffer);
|
|
}
|
|
|
|
private class FDSSOUND : IStateBufferObject
|
|
{
|
|
public byte[] reg = new byte[0x80];
|
|
public byte volenv_mode; // Volume Envelope
|
|
public byte volenv_gain;
|
|
public byte volenv_decay;
|
|
public double volenv_phaseacc;
|
|
public byte swpenv_mode; // Sweep Envelope
|
|
public byte swpenv_gain;
|
|
public byte swpenv_decay;
|
|
public double swpenv_phaseacc;
|
|
// For envelope unit
|
|
public byte envelope_enable; // $4083 bit6
|
|
public byte envelope_speed; // $408A
|
|
// For $4089
|
|
public byte wave_setup; // bit7
|
|
public int master_volume; // bit1-0
|
|
// For Main unit
|
|
public int[] main_wavetable = new int[64];
|
|
public byte main_enable;
|
|
public int main_frequency;
|
|
public int main_addr;
|
|
// For Effector(LFO) unit
|
|
public byte[] lfo_wavetable = new byte[64];
|
|
public byte lfo_enable; // 0:Enable 1:Wavetable setup
|
|
public int lfo_frequency;
|
|
public int lfo_addr;
|
|
public double lfo_phaseacc;
|
|
// For Sweep unit
|
|
public int sweep_bias;
|
|
// Misc
|
|
public int now_volume;
|
|
public int now_freq;
|
|
public int output;
|
|
|
|
public void ZeroMemory()
|
|
{
|
|
Array.Clear(reg, 0, reg.Length);
|
|
volenv_mode = 0;
|
|
volenv_gain = 0;
|
|
volenv_decay = 0;
|
|
volenv_phaseacc = 0.0;
|
|
swpenv_mode = 0;
|
|
swpenv_gain = 0;
|
|
swpenv_decay = 0;
|
|
swpenv_phaseacc = 0.0;
|
|
envelope_enable = 0;
|
|
envelope_speed = 0;
|
|
wave_setup = 0;
|
|
master_volume = 0;
|
|
Array.Clear(main_wavetable, 0, main_wavetable.Length);
|
|
main_enable = 0;
|
|
main_frequency = 0;
|
|
main_addr = 0;
|
|
Array.Clear(lfo_wavetable, 0, lfo_wavetable.Length);
|
|
lfo_enable = 0;
|
|
lfo_frequency = 0;
|
|
lfo_addr = 0;
|
|
lfo_phaseacc = 0.0;
|
|
sweep_bias = 0;
|
|
now_volume = 0;
|
|
now_freq = 0;
|
|
output = 0;
|
|
}
|
|
|
|
public uint GetSize()
|
|
{
|
|
return 512;
|
|
}
|
|
|
|
public void SaveState(StateBuffer buffer)
|
|
{
|
|
buffer.Write(reg);
|
|
buffer.Write(volenv_mode);
|
|
buffer.Write(volenv_gain);
|
|
buffer.Write(volenv_decay);
|
|
buffer.Write(volenv_phaseacc);
|
|
buffer.Write(swpenv_mode);
|
|
buffer.Write(swpenv_gain);
|
|
buffer.Write(swpenv_decay);
|
|
buffer.Write(swpenv_phaseacc);
|
|
buffer.Write(envelope_enable);
|
|
buffer.Write(envelope_speed);
|
|
buffer.Write(wave_setup);
|
|
buffer.Write(master_volume);
|
|
buffer.Write(main_wavetable);
|
|
buffer.Write(main_enable);
|
|
buffer.Write(main_frequency);
|
|
buffer.Write(main_addr);
|
|
buffer.Write(lfo_wavetable);
|
|
buffer.Write(lfo_enable);
|
|
buffer.Write(lfo_frequency);
|
|
buffer.Write(lfo_addr);
|
|
buffer.Write(lfo_phaseacc);
|
|
buffer.Write(sweep_bias);
|
|
buffer.Write(now_volume);
|
|
buffer.Write(now_freq);
|
|
buffer.Write(output);
|
|
}
|
|
|
|
public void LoadState(StateReader buffer)
|
|
{
|
|
reg = buffer.Read_bytes(0x80);
|
|
volenv_mode = buffer.Read_byte();
|
|
volenv_gain = buffer.Read_byte();
|
|
volenv_decay = buffer.Read_byte();
|
|
volenv_phaseacc = buffer.Read_double();
|
|
swpenv_mode = buffer.Read_byte();
|
|
swpenv_gain = buffer.Read_byte();
|
|
swpenv_decay = buffer.Read_byte();
|
|
swpenv_phaseacc = buffer.Read_double();
|
|
envelope_enable = buffer.Read_byte();
|
|
envelope_speed = buffer.Read_byte();
|
|
wave_setup = buffer.Read_byte();
|
|
master_volume = buffer.Read_int();
|
|
main_wavetable = buffer.Read_ints(64);
|
|
main_enable = buffer.Read_byte();
|
|
main_frequency = buffer.Read_int();
|
|
main_addr = buffer.Read_int();
|
|
lfo_wavetable = buffer.Read_bytes(64);
|
|
lfo_enable = buffer.Read_byte();
|
|
lfo_frequency = buffer.Read_int();
|
|
lfo_addr = buffer.Read_int();
|
|
lfo_phaseacc = buffer.Read_double();
|
|
sweep_bias = buffer.Read_int();
|
|
now_volume = buffer.Read_int();
|
|
now_freq = buffer.Read_int();
|
|
output = buffer.Read_int();
|
|
}
|
|
}
|
|
}
|
|
}
|